A vehicle is provided having a cargo area, a passenger compartment, and a detachable dual-use platform which is connectable to the cargo area to form a ramp, and to the underside of the vehicle to form a running board. The platform is supported by brackets at either end when used as a running board, and includes an internal locking mechanism. A platform apparatus is also provided for accessing the vehicle, including a first locator portion that is adjacent to the cargo area, and a dual-use platform portion having a step surface on one side and a second locator portion on an opposite side. The locator portions are mutually engageable to secure the platform to the cargo area. A method is also provided for accessing the vehicle, including configuring a platform for alternate attachment adjacently to the passenger compartment as a running board and adjacently to the cargo area as a ramp.